Therefore I reverse engineered two apps that are dating.

Therefore I reverse engineered two apps that are dating.

Image and video clip drip through misconfigured S3 buckets

Typically for images or other asserts, some form of Access Control List (ACL) will be in position. A common way of implementing ACL would be for assets such as profile pictures

One of the keys would act as a “password” to get into the file, as well as the password would simply be offered users who require use of the image. When it comes to a dating application, it’s going to be whoever the profile is presented to.

We have identified several misconfigured S3 buckets on The League throughout the research. All photos and videos are unintentionally made general general public, with metadata such as which user uploaded them when. Ordinarily the application would have the pictures through Cloudfront, a CDN on top associated with the buckets that are s3. Unfortunately the s3 that is underlying are severely misconfigured.

Side note: as much as i can inform, the profile UUID is arbitrarily produced server-side as soon as the profile is done. To make certain that part is not likely to be very easy to imagine. The filename is controlled because of the customer; the host takes any filename. In your client app it’s hardcoded to upload.jpg .

Owner has since disabled general public ListObjects. Nonetheless, we nevertheless think there ought to be some randomness into the key. A timestamp cannot act as key.

internet protocol address doxing through website website link previews

Link preview is something that is difficult to get appropriate in great deal of messaging apps. You will find typically three techniques for website website website link previews:

The League makes use of link that is recipient-side. Whenever a note includes a web link to an image that is external the web link is fetched on user’s unit as soon as the message is seen. This could effortlessly enable a harmful transmitter to submit an external image URL pointing to an assailant managed host, obtaining recipient’s internet protocol address if the message is exposed.

A far better solution could be merely to connect the image into the message if it is delivered (sender-side preview), or have actually the server fetch the image and place it when you look at the message (server-side preview). Server-side previews allows extra anti-abuse scanning. It might be an improved choice, yet still perhaps maybe maybe not bulletproof.

Zero-click session hijacking through talk

The application will often connect the authorization header to needs which do not need verification, such as for instance Cloudfront GET demands. It will happily give fully out the bearer token in requests to outside domain names in some instances.

One particular instances may be the image that is external in chat messages. We know already the software utilizes link that is recipient-side, and also the demand towards the outside resource is performed in recipient’s context. The authorization header is roofed into the GET demand towards the outside image Address. So that the bearer token gets leaked towards the domain that is external. When a sender that is malicious a picture website website link pointing to an assailant managed host, not just do they get recipient’s internet protocol address, nonetheless they additionally obtain victim’s session token. This really is a critical vulnerability as it enables session hijacking.

Remember that unlike phishing, this assault will not need the target to click the website website link. Once the message containing the image website website link is seen, the application immediately leaks the session token towards the attacker.

This indicates to be a bug linked to the reuse of a worldwide OkHttp customer object. It might be most readily useful if the designers ensure that the application just attaches authorization bearer header in demands into the League API.


I didn’t find any specially interesting weaknesses in CMB, but that will not suggest CMB is more safe compared to League. (See Limitations and future research). I did so look for a security that is few into asian brides for marriage the League, none of that have been specially hard to find out or exploit. I assume it is actually the mistakes that are common make again and again. OWASP top anybody?

As customers we have to be aware with which companies we trust with your information.

Vendor’s reaction

Used to do be given a response that is prompt The League after giving them a contact alerting them associated with findings. The bucket that is s3 had been swiftly fixed. One other weaknesses had been patched or at the very least mitigated in just a weeks that are few.

I believe startups could definitely provide bug bounties. It really is a good motion, and even more importantly, platforms like HackerOne offer scientists a appropriate way to the disclosure of weaknesses. Regrettably neither of this two apps within the post has program that is such.

Limits and future research

This scientific studies are maybe maybe maybe not comprehensive, and really should never be regarded as a security review. Almost all of the tests in this article had been done regarding the system IO degree, and hardly any on the customer it self. Particularly, I did not test for remote rule execution or buffer overflow kind weaknesses. In future research, we’re able to look more in to the protection of this customer applications.

This might be finished with powerful analysis, making use of techniques such as for example:

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